The rains that passed on June 26-27 contributed to the manifestation of late blight of potatoes on public plantings. The first signs of the disease were noted on early potato varieties on 2 July.
Preventive fungicidal treatments in potato farms of the region are carried out from the phase of closing the tops in rows, until the first symptoms of the disease appear. The first treatments that are started after the formation of foci of infection will be less effective.
In order to avoid significant losses in the yield of potatoes, it is necessary to strictly observe and maintain the frequency and intervals of treatments.
The first two treatments are carried out with systemic contact drugs - Ridomil Gold MC, EDG, Acrobat MC, EDG, Thanos, EDG, Ordan, SP, Infinito, KS, Revus, KS, Luna Tranquility, KS and others with an interval of 10-14 days, but not later than the potato flowering phase. Even for preparations of systemic action, it is necessary that after treatment the weather should stand for 1,5-2 hours without rain.
When populating potato plantings with a Colorado potato beetle with a population above the EPV, fungicide treatment is combined with insecticides.
For subsequent treatments (in the second growing season) it is necessary to use preparations of contact action - Revus Top, SK; Bravo, KS, Poliram DF, VDG, Shirlan, SK with an interval of 7-10 days, depending on the duration of the fungicidal action. The tops must be protected with fungicides until they die off completely or are removed before harvest.
The frequency of treatments against late blight will depend on the meteorological conditions of the season and the resistance of the variety to the disease.
All treatments must be carried out with drugs in accordance with the "List of pesticides and agrochemicals permitted for use in the territory of the Russian Federation." Particular attention should be paid to seed potato planting.
The use of biofungicides is possible on moderately susceptible or moderately resistant potato varieties.
The safety of the use of pesticides and agrochemicals is ensured by compliance with the established regulations and rules for the use of pesticides and agrochemicals, excluding their negative impact on human health and the environment.